Whiteglass right_ptr pointer points incorrectly

The "hot point" for /usr/share/icons/whiteglass/cursors/right_ptr seems to be off by about 9 pixels (for a cursor size of 32 at least).

This is specially annoying because you're not clicking where you think you're clicking. In the attached example, the cursor seems to be pointing to the "i", but it is actually pointing to the [-] box, so attempting to select text (without noticing that the pointer is not I-beam-shaped) results in the [-] box being clicked instead.

This problem does not exist in the redglass theme (which is identical but in red).

Distro/version: Xubuntu 18.04 64b
Screen resolution: 144 dpi
Pointer theme: whiteglass
Pointer size: 32 (but also seems to happen at other sizes)
Graphics card: Nvidia GeForce GTX 1050 Mobile
Graphics driver: nvidia-driver-390